Carbon isotopes across the Eocene‐Oligocene boundary sequence of Kutch, western India: Implications to oceanic productivity and pCO 2  change | Zendy

Sarkar A. | Zendy; Sarangi S. | Zendy; Bhattacharya S. K. | Zendy; Ray A. K. | Zendy

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Carbon isotopes across the Eocene‐Oligocene boundary sequence of Kutch, western India: Implications to oceanic productivity and pCO 2 change

Author(s) -

Sarkar A.,

Sarangi S.,

Bhattacharya S. K.,

Ray A. K.

Publication year - 2003

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/2002gl016541

Subject(s) - geology , extinction event , oceanography , productivity , isotopes of carbon , cenozoic , benthic zone , oceanic basin , total organic carbon , global cooling , climate change , weathering , carbon cycle , climatology , paleontology , structural basin , ecosystem , chemistry , ecology , environmental chemistry , biological dispersal , population , demography , sociology , biology , economics , macroeconomics

Analyses of foraminiferal δ 18 O (δ 18 O carb ), δ 13 C (δ 13 C carb ) and bulk organic matter (δ 13 C org ) across a tropical Eocene/Oligocene boundary (EOB) section from Kutch basin, western India show that the ocean cooling (at least ∼3°C) is coincident with a rapid enrichment (∼3‰) in δ 13 C org but depletion (∼1.5‰) in δ 13 C carb . The decrease in pCO 2 in ocean‐atmosphere system across the boundary, possibly resulting from enhanced silicate weathering in rising Himalayas and accompanied organic carbon burial in ocean, caused the cooling and δ 13 C org enrichment. The end‐Eocene climatic stress decreased the oceanic productivity (and δ 13 C carb ) eventually causing extinction of larger benthic foraminiferal community. The data suggest a critical role of tropical ocean and direct forcing of CO 2 on global climate change at least for this crucial Cenozoic transition.

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